An adjustable two-dimensional tail nozzle

Abstract

This utility model discloses an adjustable two-dimensional tail nozzle, belonging to the field of two-dimensional tail nozzle technology; it includes a connected engine and an adapter casing. A servo is provided on one side of the adapter casing. The output side of the adapter casing consists of a rectangular opening formed by two oppositely arranged fixed plates and two oppositely arranged adjusting plates. A power arm is provided at the output end of the servo. The right end of the power arm is connected to two parallel first connecting rods by a pin shaft. The other ends of the two first connecting rods are respectively connected to two second connecting rods. It can be applied to small afterburning turbojet engines to improve the flight speed of UAVs. Its structure is simple. The synchronous opening and closing movement of the adjusting plates is achieved through a single servo drive source, reducing the control difficulty, realizing engine thrust adjustment, reducing the number of structures, and making it lightweight, highly reliable, and low in cost. By setting a support rod on the outside of the adjusting plate, the adjusting plate can be limited. The structure is simple and the use effect is good.

Description

Technical Field

[0001] This utility model relates to an adjustable binary tail nozzle, belonging to the field of binary tail nozzle technology. Background Technology

[0002] With the development of modern local warfare, the advantages of reconnaissance drones, strike drones, small cruise missiles, and loitering munitions have become increasingly prominent, making them a key research focus for various countries. Small turbojet engines, due to their advantages of small size, light weight, high energy density, high thrust-to-weight ratio, and wide range, are often used as power plants for these aircraft. Many drones and attack aircraft abroad are also equipped with small turbojet engines. However, as aircraft flight Mach numbers continue to increase, higher demands are placed on the performance of turbojet engines, often requiring the addition of afterburners. This necessitates the design of adjustable exhaust nozzles to ensure that all engine components operate at their optimal state and generate maximum thrust.

[0003] Adjustable convergent nozzles enable engines to achieve good performance under various operating conditions. Engines with afterburners must use adjustable nozzles to ensure a correspondingly larger nozzle size under afterburner conditions. Engine operating conditions can also be altered by changing the nozzle area; the main types include multi-scale nozzles, double-scale nozzles, moving tail cone nozzles, and pneumatically adjustable nozzles. Existing traditional nozzle adjustment control schemes mostly use hydraulic control systems, but these are heavy, costly, and complex, making them unsuitable for small turbojet engines. Fish-scale nozzles are more commonly used in small turbojet engines, but they have a larger number of structural components and are relatively more expensive.

[0004] When using afterburner, to maintain the maximum operating state of all components before the turbine, the exhaust area of ​​the tail nozzle must be increased simultaneously to accommodate the increase in the specific volume of the gas. The main function of the tail nozzle is to allow the gas to continue expanding, fully converting the remaining enthalpy in the gas into kinetic energy, thereby expelling it at high speed from the tail nozzle and increasing flight speed. If traditional tail nozzle control technology is used, its complex control system and structural dimensions make it difficult to apply to the power system of small, high-speed UAVs. Therefore, designing an adjustable two-dimensional tail nozzle is essential. Utility Model Content

[0005] This invention addresses the shortcomings of the existing technology by providing an adjustable two-dimensional tail nozzle.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] An adjustable two-dimensional exhaust nozzle includes a connected engine and an adapter housing. A servo motor is provided on one side of the adapter housing. The output side of the adapter housing consists of a rectangular opening formed by two opposing fixed plates and two opposing adjustable plates. A power arm is provided at the output end of the servo motor. The right end of the power arm is connected to two parallel first connecting rods via a pin. The other ends of the two first connecting rods are respectively connected to two second connecting rods. The other ends of the second connecting rods are connected to a pivot shaft passing through the two fixed plates. A guide rail is provided on the outer side of the fixed plate on the servo motor side, and the pin shaft is slidably connected to the guide rail.

[0008] Furthermore, a rocker arm is provided between the servo motor output end and the power arm.

[0009] Furthermore, both of the aforementioned adjustment plates are provided with support rods on their outer sides, and both ends of the support rods are fixed to the two fixed plates.

[0010] Furthermore, the guide rail is fixed at the middle of the contact surface between the fixing plate and the adapter casing.

[0011] Furthermore, the first link and the second link, as well as the second link and the rotating shaft, are all connected by pins.

[0012] Furthermore, the rotating shaft is provided with a groove for mounting an adjustment plate at the position between the two fixed plates.

[0013] Furthermore, a fixing seat is provided on the outer end of the fixing plate that contacts the rotating shaft, and the fixing seat is provided with an opening or hole that is adapted to the rotating shaft.

[0014] Furthermore, the guide rail has an elongated opening.

[0015] Furthermore, the two first connecting rods and the two second connecting rods are arranged in a W shape facing the engine direction.

[0016] Furthermore, a support frame is provided between the adapter casing and the servo motor, and the support frame is fixed to one side of the adapter casing.

[0017] Compared with the prior art, the beneficial effects of this utility model are: it is adapted to small afterburning turbojet engines, improves the flight speed of UAVs, has a simple structure, realizes the synchronous opening and closing movement of the adjustment plate through a single servo drive source, reduces the control difficulty, realizes engine thrust adjustment, reduces the number of structures, is lightweight and highly reliable, and has low cost; by setting a support rod on the outside of the adjustment plate, the adjustment plate can be limited. The structure is simple and the use effect is good. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model in use.

[0020] In the diagram, 1 is the engine; 2 is the adapter housing; 3 is the servo motor; 31 is the support frame; 4 is the mounting plate; 5 is the adjusting plate; 6 is the support rod; 7 is the mounting base; 8 is the guide rail; 10 is the first connecting rod; 11 is the second connecting rod; and 12 is the power arm. Detailed Implementation

[0021] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0022] like Figures 1-2 As shown, the adjustable two-dimensional tail nozzle of this embodiment includes a connected engine 1 and an adapter housing 2. A servo motor 3 is provided on one side of the adapter housing 2. The output side of the adapter housing 2 is formed by two oppositely arranged fixed plates 4 and two oppositely arranged adjusting plates 5 forming a rectangular opening. A power arm 12 is provided at the output end of the servo motor 3. The right end of the power arm 12 is connected to two parallel first connecting rods 10 by a pin. The other ends of the two first connecting rods 10 are respectively connected to two second connecting rods 11. The other ends of the second connecting rods 11 are connected to the pivots that pass through the two fixed plates 4. A guide rail 8 is provided on the outer side of the fixed plate 4 on the side of the servo motor 3. The pin is slidably connected to the guide rail.

[0023] A rocker arm is provided between the output end of the servo motor 3 and the power arm 12.

[0024] Both of the two adjusting plates 5 are provided with support rods 6 on their outer sides, and both ends of the support rods 6 are fixed to the two fixing plates 4.

[0025] The guide rail 8 is fixed at the middle of the contact surface between the fixing plate 4 and the adapter box 2.

[0026] The first connecting rod 10 and the second connecting rod 11, and the second connecting rod 11 and the rotating shaft are all connected by pins. The rotating shaft and the outer side of the fixed plate 4 are both provided with bearings adapted to the rotating shaft.

[0027] The rotating shaft is located between two fixed plates 4 and has a groove for mounting an adjustment plate 5.

[0028] The outer end of the fixing plate 4 is provided with a fixing seat 7 on the side that contacts the rotating shaft. The fixing seat 7 is provided with an opening or hole that is adapted to the rotating shaft.

[0029] The guide rail 8 has a long, narrow opening.

[0030] The two first connecting rods 10 and the two second connecting rods 11 are W-shaped facing the engine 1.

[0031] A support frame 31 is provided between the adapter housing 2 and the servo motor 3, and the support frame 31 is fixed to one side of the adapter housing 2.

[0032] During operation, the adjustable tail nozzle is installed on the adapter housing 2. The adapter housing 2 has a round-to-square structure, which can reduce airflow loss. The servo motor 3 is fixed to the adapter housing 2 through the support frame 31. The power arm 12 drives the two first connecting rods 10 and the two second connecting rods 11 in linkage under the drive of the servo motor 3. The pin connecting the power arm 12 and the two first connecting rods 10 connected in parallel moves back and forth inside the guide rail 8, thereby adjusting the opening and closing of the adjustment plate 5 through the rotating shaft to achieve the purpose of controlling the convergence and expansion of the tail nozzle.

[0033] This invention proposes an adjustable two-dimensional tail nozzle scheme adapted to a small turbojet engine 1. It can be applied to a small afterburning turbojet engine 1 to improve the flight speed of a UAV. Its structure is simple, and the synchronous opening and closing movement of two adjusting plates 5 is achieved by a single servo motor 3 as the driving source, which reduces the control difficulty, realizes the thrust adjustment of the engine 1, reduces the number of structures, is lightweight, highly reliable, and low in cost. By setting a support rod 6 on the outside of the adjusting plate 5, the adjusting plate 5 can be limited. The structure is simple and the performance is good.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable binary afterburner comprising a connected engine (1) and a relay box (2), characterized in that: The adapter casing (2) is provided with a servo motor (3) on one side. The output side of the adapter casing (2) is formed by two oppositely arranged fixed plates (4) and two oppositely arranged adjusting plates (5) forming a rectangular opening. The output end of the servo motor (3) is provided with a power arm (12). The right end of the power arm (12) is connected to two parallel first connecting rods (10) by a pin. The other ends of the two first connecting rods (10) are respectively connected to two second connecting rods (11). The other ends of the second connecting rods (11) are connected to the rotating shaft that passes through the two fixed plates (4). The outer side of the fixed plate (4) on the side of the servo motor (3) is provided with a guide rail (8). The pin is slidably connected to the guide rail (8).

2. The adjustable binary tailpipe of claim 1, wherein: A rocker arm is provided between the output end of the servo motor (3) and the power arm (12).

3. The adjustable binary exhaust nozzle of claim 1, wherein: Both of the adjustment plates (5) are provided with support rods (6) on their outer sides, and both ends of the support rods (6) are fixed to the two fixed plates (4).

4. The adjustable binary exhaust of claim 1, wherein: The guide rail (8) is fixed at the middle of the contact surface between the fixing plate (4) and the adapter box (2).

5. The adjustable binary exhaust nozzle of claim 1, wherein: The first link (10) and the second link (11), and the second link (11) and the rotating shaft are all connected by pins.

6. The adjustable binary exhaust of claim 1, wherein: The rotating shaft is located between two fixed plates (4) and has a groove for installing an adjustment plate (5).

7. The adjustable binary exhaust of claim 1, wherein: The outer end of the fixing plate (4) is provided with a fixing seat (7) on the side that contacts the rotating shaft. The fixing seat (7) is provided with an opening or hole that is compatible with the rotating shaft.

8. The adjustable binary exhaust of claim 1, wherein: The guide rail (8) is a long, narrow opening.

9. The adjustable binary exhaust of claim 1, wherein: The two first connecting rods (10) and the two second connecting rods (11) are W-shaped facing the engine (1).

10. The adjustable binary exhaust of claim 1, wherein: A support frame (31) is provided between the adapter box (2) and the servo motor (3), and the support frame (31) is fixed to one side of the adapter box (2).

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